3.7: Summary
- Page ID
- 2395
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- Cells consist of three parts: the plasma membrane, cytoplasm and nucleus.
- Substances pass through the plasma membrane by diffusion(gases, lipids), osmosis (water), active transport (glucose, ions), phagocytosis (particles), pinocytosis (fluids) and exocytosis (particles and fluids).
- Osmosis is the diffusion of water through a semipermeable membrane. Water diffuses from high water "concentration" to low water "concentration".
- The cytoplasm consists of cytosol in which are suspended cell inclusions and organelles.
- organelles include ribosomes, endoplasmic reticulum, mitochondria, Golgi bodies and lysosomes.
- The nucleus controls the activity of the cell. It contains the chromosomes that are composed of DNA.
- The cell divides by mitosis and meiosis